I can't speak for the rest of the country, but here in the deep South it would be something like fried chicken, baked ham or meat loaf, mashed potatoes, macaroni and cheese, green beans, turnip greens, lima beans, fried okra, corn, peas, fried green tomatoes, rutabegas, cornbread, and sweet iced tea, the House Wine of the South.
And those green beans wouldn't be the little skinny round al dente crunchy kind so many people cook these days. They would be fresh wide flat beans that you string and snap then cover with water in a big pot on the stove, add some bacon grease, a pinch of sugar, salt and pepper and some fat back or a ham hock and cook all day long. LOL
Some other great comfort foods are chicken and dumplings, and chicken and cornbread dressing.
Now, we'd have to top off that meal with a nice slice of pecan pie or sweet potato pie. Yummo!
And then there's our BBQ meal with a slab of pork spare ribs, shredded pork, smoked sausage, corn on the cob, baked beans, potato salad, deviled eggs, and some more of that wonderful sweet iced tea.
And then there's breakfast...eggs cooked to order, bacon, sausage, fried ham with red-eye gravy, cathead biscuits, sawmill gravy, and most important, a big pot of grits. Plain grits or cheese grits. And no true Southerner would ever admit to putting sugar on their grits. We call that Yankee Grits. LOL 
And we don't put sugar in the cornbread, either. LOL We call those muffins.